# -*- encoding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution	
#    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>). All Rights Reserved
#    $Id$
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################

import StringIO

from report.render import render
from report.interface import report_int

from mx import DateTime
import time

from pychart import *
import pychart.legend

import _burndown

class external_pdf(render):
    def __init__(self, pdf):
        render.__init__(self)
        self.pdf = pdf
        self.output_type='pdf'
    def _render(self):
        return self.pdf

def burndown_chart(cr, uid, tasks_id, date_start, date_stop):
    latest = False
    cr.execute('select id,date_start,state,planned_hours from project_task where id in ('+','.join(map(str,tasks_id))+') order by date_start')
    tasks = cr.fetchall()
    cr.execute('select id,date_close,state,planned_hours*progress/100 from project_task where id in ('+','.join(map(str,tasks_id))+') and state in (%s,%s) order by date_close', ('progress','done'))
    tasks2 = cr.fetchall()
    current_date = date_start
    total = 0
    done = 0
    result = []
    while current_date<=date_stop:
        while len(tasks) and tasks[0][1] and tasks[0][1][:10]<=current_date:
            total += tasks.pop(0)[3]
        while len(tasks2) and tasks2[0][1] and tasks2[0][1][:10]<=current_date:
            t2 = tasks2.pop(0)
            if t2[2]<>'cancel':
                done += t2[3]
            else:
                total -= t2[3]
        result.append( (int(time.mktime(time.strptime(current_date,'%Y-%m-%d'))), total-done) )
        current_date = (DateTime.strptime(current_date, '%Y-%m-%d') + DateTime.RelativeDateTime(days=1)).strftime('%Y-%m-%d')
        if not len(tasks) and not len(tasks2):
            break
    result.append( (int(time.mktime(time.strptime(date_stop,'%Y-%m-%d'))), 0) )
    return result

class report_tasks(report_int):
    def create(self, cr, uid, ids, datas, context={}):
        io = StringIO.StringIO()

        if 'date_start' not in datas:
            cr.execute('select min(date_start) from project_task where id in ('+','.join(map(str,ids))+')')
            dt = cr.fetchone()[0]
            if dt:
                datas['date_start'] = dt[:10]
            else:
                datas['date_start'] = time.strftime('%Y-%m-%d')
        if 'date_stop' not in datas:
            cr.execute('select max(date_start),max(date_close) from project_task where id in ('+','.join(map(str,ids))+')')
            res = cr.fetchone()
            datas['date_stop'] = (res[0] and res[0][:10]) or time.strftime('%Y-%m-%d')
            if res[1] and datas['date_stop']<res[1]:
                datas['date_stop'] = res[1][:10]

        date_to_int = lambda x: int(x.ticks())
        int_to_date = lambda x: '/a60{}'+DateTime.localtime(x).strftime('%d/%m/%Y')

        datas = _burndown.compute_burndown(cr, uid, ids, datas['date_start'], datas['date_stop'])

        canv = canvas.init(fname=io, format='pdf')
        canv.set_author("Open ERP")

        max_hour = reduce(lambda x,y: max(y[1],x), datas, 0)

        date_to_int = lambda x: int(x.ticks())
        int_to_date = lambda x: '/a60{}'+DateTime.localtime(x).strftime('%d %m %Y')

        def _interval_get(*args):
            result = set()
            for i in range(20):
                d = DateTime.localtime(datas[0][0] + (((datas[-1][0]-datas[0][0])/20)*(i+1)))
                res = DateTime.DateTime(d.year, d.month, d.day).ticks()
                result.add(res)

            return list(result)

        if datas[-1][0] == datas[0][0]:
            x_range = (datas[0][0],datas[-1][0]+1)
        else:
            x_range = (datas[0][0],datas[-1][0])

        ar = area.T(x_grid_style=line_style.gray50_dash1,
            x_axis=axis.X(label="Date", format=int_to_date),
            y_axis=axis.Y(label="Burndown Chart - Planned Hours"),
            x_grid_interval=_interval_get,
            x_range = x_range,
            y_range = (0,max_hour),
            legend = None,
            size = (680,450))
        ar.add_plot(line_plot.T(data=datas))
        ar.draw(canv)
        canv.close()

        self.obj = external_pdf(io.getvalue())
        self.obj.render()
        return (self.obj.pdf,'pdf')
report_tasks('report.project.tasks.burndown')

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